Frontend Frameworks

Johnny-Five

Firmata based Arduino Framework for JavaScript and Node.js.

Status
UnmaintainedNo commits in 1252 days.
Last checked
Checked · Oct 11, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

Johnny-Five is a powerful framework that allows developers to write code in JavaScript or CoffeeScript to control hardware devices connected via Firmata protocol. It simplifies the process of interacting with microcontrollers like Arduino, making it easier for developers to build IoT projects.

Johnny-Five stands out as a comprehensive and user-friendly framework for controlling microcontrollers via Firmata, offering extensive support for various hardware boards.

When it fits — and when it doesn’t

A good fit for

  • JavaScript developers looking to control hardware devices with ease

  • Makers who want a robust framework for building IoT projects

  • Educators aiming to teach programming through interactive hardware projects

Look elsewhere if

  • Projects requiring real-time processing without the Firmata protocol

  • Developers preferring languages other than JavaScript or CoffeeScript

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited language support

    Primarily supports JavaScript and CoffeeScript, which may not be suitable for all developers or projects

  2. 02

    Dependence on Firmata protocol can limit flexibility

    Firmata is a specific communication protocol that might not support all microcontroller functionalities or require additional setup

  3. 03

    Performance overhead due to JavaScript runtime

    Running on Node.js can introduce latency compared to native C/C++ implementations for microcontrollers

What it does well

  • Supports Firmata protocol for communication with microcontrollers

  • Extensive library of plugins and boards support

  • Cross-platform compatibility (Windows, macOS, Linux)

  • Active community and extensive documentation

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up Johnny-Five

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →